Sunāmganj climate — normals and trends
Sunāmganj (Bangladesh) has a humid subtropical, dry winter climate (Cwa) under the Köppen-Geiger classification. Its mean annual temperature is 23.7 °C and it receives 4,764 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (27.5 °C on average) and the coldest is January (16.9 °C). Rainfall peaks in June.
Sunāmganj averages 0 frost days, 137 hot days (≥ 30 °C) and 206 rainy days per year.
Sunāmganj has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.8 °C (on 13 April 1957) and the coldest 4.6 °C (on 10 January 2013).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
SunāmganjSylhet Division
- coords
- 25.07°, 91.40°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.7°C
Average daily high
28.5°C
Average daily low
19.9°C
Annual rainfall
4,764mm
Sunshine / day
8.4h
Mean relative humidity
80%
Average peak wind
7.9km/h
Seasonal range
10.6°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
137 d/yr
Rainy days (≥ 1 mm)
206 d/yr
Annual snowfall
0.0 cm
Average feels-like high
32.7 °C
Average feels-like low
22.8 °C
Average peak gust
24.9 km/h
Tropical nights (≥ 20 °C)
210 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.56 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.8 °C
13 April 1957
Coldest day
4.6 °C
10 January 2013
Wettest day
350 mm
25 June 1988
Windiest day
42.2 km/h
28 May 2024
Strongest gust
114.8 km/h
28 May 2024
Hottest feels-like
46.7 °C
25 May 2024
Coldest feels-like
3.1 °C
10 January 2013
Sunniest day
13.1 h
2 July 1942
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 24.8 °C | +1.0 °C | 11 mm | -2 mm |
| Feb | 26.8 °C | +0.9 °C | 15 mm | -18 mm |
| Mar | 30.2 °C | +1.2 °C | 50 mm | -92 mm |
| Apr | 30.8 °C | +1.1 °C | 335 mm | -151 mm |
| May | 30.9 °C | +1.0 °C | 512 mm | -247 mm |
| Jun | 31.9 °C | +1.7 °C | 667 mm | -271 mm |
| Jul | 32.4 °C | +2.0 °C | 777 mm | -111 mm |
| Aug | 31.2 °C | +0.6 °C | 668 mm | -57 mm |
| Sep | 32.8 °C | +2.3 °C | 527 mm | +31 mm |
| Oct | 32.0 °C | +2.3 °C | 195 mm | -44 mm |
| Nov | 29.0 °C | +1.3 °C | 41 mm | +5 mm |
| Dec | 25.4 °C | +0.5 °C | 0 mm | -11 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Sunāmganj?
Sunāmganj has a humid subtropical, dry winter climate (Köppen Cwa). Over 1940-2025, the average annual temperature is 23.7 °C and it receives 4,764 mm of precipitation per year.
What is the hottest day ever recorded in Sunāmganj?
The hottest day measured in Sunāmganj between 1940 and 2025 was 13 April 1957, reaching 39.8 °C.
What is the coldest day in Sunāmganj?
The coldest day measured in Sunāmganj between 1940 and 2025 was 10 January 2013, at 4.6 °C.
Does it snow in Sunāmganj?
Almost never: Sunāmganj sees virtually no snow, with about 0 frost days per year.
Has the climate of Sunāmganj warmed?
Yes: Sunāmganj warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sunāmganj?
The wettest day measured in Sunāmganj between 1940 and 2025 was 25 June 1988, with 350 mm of rain in 24 hours.
What was the windiest day in Sunāmganj?
The windiest day measured in Sunāmganj between 1940 and 2025 was 28 May 2024, with winds reaching 42.2 km/h.
What is the warmest month in Sunāmganj?
The warmest month in Sunāmganj is August (27.5 °C on average); the coldest is January (16.9 °C).
How much does it rain in Sunāmganj?
Sunāmganj receives on average 4,764 mm of precipitation per year, spread over about 206 rainy days.
Is it sunny in Sunāmganj?
Sunāmganj gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
Are there tropical nights in Sunāmganj?
Yes: Sunāmganj has on average 210 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sunāmganj?
In Sunāmganj, between 1940 and 2025, the highest apparent temperature reached 46.7 °C on 25 May 2024, and the lowest was 3.1 °C on 10 January 2013.
Compare Sunāmganj with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sunāmganj